The Publish-Subscribe protocol is specified in XEP-0060 (a Draft Standard of the XMPP Standards Foundation). This specification defines an XMPP protocol extension for generic publish-subscribe functionality. The protocol enables XMPP entities to create nodes (topics) at a pubsub service and publish information at those nodes; an event notification (with or without payload) is then broadcasted to all entities that have subscribed to the node. Pubsub therefore adheres to the classic Observer design pattern and can serve as the foundation for a wide variety of applications, including news feeds, content syndication, rich presence, geolocation, workflow systems, network management systems, and any other application that requires event notifications.

The following XML namespaces are used in the context of the Publish-Subscribe protocol:

The following XML schemas are available for the Publish-Subscribe protocol:

Information about this XMPP protocol is maintained by the XMPP Registrar.